34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18in diameter but you’ll appreciate the benefits

but you’ll appreciate the benefits over a long period of time

6" width X 11

Rigid Built For External Use– The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the louvers

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34" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18in diameter but you’ll appreciate the benefits+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 18" Or 18" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 17. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum